Well, I made the attempt to install a Koolance system onto a Maximus 4. The CPU mounting block that Koolance would have you remove seems to be attached to the backplate on the CPU. When you remove the mounting bracket, it falls off.

So, let's suppose you leave it on. there is a space in between the top of the CPU and the sides approximately 1 mm thick. I'm thinking, what if you just use a lot of Arctic Silver and leave the bracket on?

Maybe that'd be more compatible. I'd probably have to order another one to try it, though. So it'll be a few weeks before I find out.